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Within the United States, your "Route 87", "Route 89", and "Route 91" (typically referred to as "Interstate 87", "Interstate 89", and "Interstate 91") are all Interstate Highways, the top class of long-distance road in the United States. Consequently, all three of them will be kept as clear of snow as possible. Which one of them will be the best will be ...

I don't think taking I-87 is going to be a serious consideration for a trip between Montreal and Boston. It's on the wrong side of Lake Champlain, so you'll have to go far out of your way and extend your trip by an hour or more.
The route taken by Greyhound is essentially identical to the first option given by Google Maps for a trip between Montreal and ...